Hi all, im a newbie with richfaces, i hope u can help me with a problem that im having right now.

here's the code;

<h:panelGroup id="searchPanel">
<h:form>
 <h:panelGrid columns="3" id="select_maker" cellpadding="2">
 <h:outputText value="Select handset maker"/>
 <h:outputText value=" "/>
 <h:selectOneMenu id="makers"
 value="#{gameHandsetController.makerId}"
 styleClass="select_handset">
 <f:selectItem itemValue="Please select one ..."/>
 <f:selectItems value="#{gameHandsetController.handsetMakerListSelectItems}"/>
 <a4j:support event="onchange" reRender="select_model, out"
 ajaxSingle="true"
 actionListener="#{gameHandsetController.changeMakerValue}"
 status="status"/>
 </h:selectOneMenu>
 </h:panelGrid>
</h:form>

<h:form>
 <h:panelGrid id="select_model" columns="3" cellpadding="2">
 <h:outputText value="Select handset model"/>
 <a4j:status id="status">
 <f:facet name="start">
 <h:graphicImage value="../images/ajax-loader-small.gif"/>
 </f:facet>
 </a4j:status>
 <h:selectOneMenu id="models"
 styleClass="select_handset"
 value="#{gameHandsetController.modelId}">
 <f:selectItems value="#{gameHandsetController.handsetModelListSelectItems}" />
 </h:selectOneMenu>
 </h:panelGrid>
 <a4j:commandButton reRender="gameList,out" ajaxSingle="true"
 actionListener="#{gameHandsetController.doSearch}"
 value="search">
 <a4j:actionparam assignTo="#{gameHandsetController.modelId}"
 value="#{gameHandsetController.modelId}"/>
 </a4j:commandButton>
</h:form>
</h:panelGroup>

the problem is, when the command button is clicked, the value gameHandsetController.modelId is not assigned. Here's the code for gameHandssetController.doSearch.

public void doSearch(ActionEvent event) {
 log.debug("modelId=" + modelId + " event=" + event.toString());
 retrieveGameList();
}
public void setModelId(String modelId) {
 log.debug("setModelId=" + modelId);
 this.modelId = modelId;
}

Here's what my log prints out (I put a log print in PhaseListener so I know what's going on)

AccessFilter - doFilter: Requesting IP=127.0.0.1 accessing=/web/guide/gamehandsetsearch.jsf referred by=http://localhost/web/guide/gamehandsetsearch.jsf.
 PhaseListener - beforePhase: BEFORE RESTORE_VIEW 1
 PhaseListener - afterPhase: AFTER RESTORE_VIEW 1
 PhaseListener - beforePhase: BEFORE APPLY_REQUEST_VALUES 2
 PhaseListener - afterPhase: AFTER APPLY_REQUEST_VALUES 2
 PhaseListener - beforePhase: BEFORE PROCESS_VALIDATIONS 3
 PhaseListener - afterPhase: AFTER PROCESS_VALIDATIONS 3
 PhaseListener - beforePhase: BEFORE UPDATE_MODEL_VALUES 4
 PhaseListener - afterPhase: AFTER UPDATE_MODEL_VALUES 4
 PhaseListener - beforePhase: BEFORE INVOKE_APPLICATION 5
 GameHandsetController - <init>: params makerId=, pageNo=1
 GameHandsetController - doSearch: modelId=null event=javax.faces.event.ActionEvent[source=org.ajax4jsf.component.html.HtmlAjaxCommandButton@1d7e5f7]
 GameHandsetDAO - getGameHandset: GameHandsetDAO with param msId=null, pageNo=1
 GameHandsetController - setModelId: setModelId=
 GameHandsetDAO - getGameHandset: GameHandsetDAO with param msId=, pageNo=1
 PhaseListener - afterPhase: AFTER INVOKE_APPLICATION 5
 PhaseListener - beforePhase: BEFORE RENDER_RESPONSE 6
 PhaseListener - afterPhase: AFTER RENDER_RESPONSE 6

Can anybody tell me what i did wrong?
thank you in advance!